The middle schoolers are invited to participate in the U-17 Japanese team's training camp. The "losers" who were once dismissed from the camp have overcome their trials and returned, and the camp is lively once again. In room 205, Akaya tells his silent roommates stories about fallen soldiers. In room 201, Fuji and his roommates excitedly discuss the potted plants they brought. In room 211, the Golden Pair starts a pillow fight... Meanwhile, Sanada carries a message from Coach Mifune. The camp's first string of powerful players are returning from their month long tour abroad!

Matches against the first string's No. 11 through 20 begin. Yanagi faces off against No. 17 Mitsuya. To Inui's surprise, he calls Mitsuya "Akuto-niisan." Mitsuya is the man who taught Yanagi Data Tennis when he was younger. Though it's a battle between two powerful Data Tennis players, Inui senses something is off when he sees Mitsuya toying with Yanagi... Meanwhile, Momoshiro and Kenya battling the No. 18 Hira and No. 19 Hara Shitenhoji OB doubles team find themselves struggling against their opponents' unique rhythm.

The middle schoolers' battle against the first string's No. 11 through 20 continues. Yukimura's opponent is No. 11 Fuwa. However, before the first shot, Fuwa offers Yukimura a handicap and blindfolds himself. Fuwa demonstrates his skills despite his lack of vision, but Yukimura shows no signs of giving up. He even challenges Fuwa, saying he doesn't need a handicap... Meanwhile, Irie plays against No. 20 Akiba. Akiba calls Irie's theatrical style "cheap acting." Thrown into a rage by his words, Irie recalls his conversation with Atobe...

The middle schoolers defeat their opponents, acquire the No. 11 through 20 pins, and go on to face their next opponents, the first string's No. 1 through 10, also known as the Genius 10! At No. 1 Byodoin Houou's suggestion, they agree to conduct shuffle matches the next morning with their spots on the Japanese team at stake. The night before the battle, as Ryoma and Tokugawa are practicing on the courts, Byodoin hits a powerful shot their way. Tokugawa shields Ryoma with his body, but there's a second shot...! Cutting in front of Ryoma with his racket in hand to return the shot is a mysterious hooded first string player. The name of the man who easily returned Byodoin's fastball is Echizen Ryoga. He claims to be Ryoma's brother, but...